66749736 has 32 divisors (see below), whose sum is σ = 175658400. Its totient is φ = 21078720.

The previous prime is 66749713. The next prime is 66749741. The reversal of 66749736 is 63794766.

66749736 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72735 + ... + 73646.

It is an arithmetic number, because the mean of its divisors is an integer number (5489325).

Almost surely, 2^66749736 is an apocalyptic number.

It is an amenable number.

66749736 is an abundant number, since it is smaller than the sum of its proper divisors (108908664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66749736 is a wasteful number, since it uses less digits than its factorization.

66749736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146409 (or 146405 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 48.

The square root of 66749736 is about 8170.0511626305. The cubic root of 66749736 is about 405.6484779577.

It can be divided in two parts, 667 and 49736, that added together give a triangular number (50403 = T₃₁₇).

The spelling of 66749736 in words is "sixty-six million, seven hundred forty-nine thousand, seven hundred thirty-six".